Cast up some pure lead RB's and put them in 20ga claybuster 7/8 wads. The petal thickness on the wads brings the total diameter to .640 which really concerns me in a .620 smooth bore. Remington sp20 wads give me .620 so I feel better there. From what I've rad here you fellows use the BP Commander wad, what is the petal thickness on it? I don't want to screw up a barrel just to play around plinking. My plan was just to plink using target loads @ 1200 fps.